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首页> 外文期刊>ISIJ international >Production of Niobium Powder by Magnesiothermic Reduction of Feed Preform
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Production of Niobium Powder by Magnesiothermic Reduction of Feed Preform

机译：镁热还原预成型坯生产铌粉

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摘要

To develop an effective production process of niobium powder, a new preform reduction process (PRP) based on the magnesiothermic reduction of feed preform containing niobium oxide (Nb_2O_5) was investigated. The feed preform was fabricated from slurry, which was made by mixing Nb_2O_5 powder, flux (e.g., CaCO_3) and binder. Various compositions of preform in the form of plates were prepared using a conventional technique, and the fabricated preform was heated at 1273 K before reduction in order to remove the binder and water. The sintered solid preform containing Nb_2O_5 was then placed in a stainless steel container, and made to react with magnesium vapor at a constant temperature, ranging between 1073 and 1273 K, for six hours. Niobium powder was recovered from the reduced preform by acid leaching. Niobium metal powder with 99 mass percent purity was obtained as a result. This process was found to be suitable for producing a homogenous fine powder, when the composition of flux, and reduction conditions are controlled.
机译：为了开发一种有效的铌粉生产工艺，研究了一种基于镁热还原含铌氧化物（Nb_2O_5）的饲料预成型坯的新的预成型坯还原工艺（PRP）。进料预成型件是由浆料制成的，该浆料是通过将Nb_2O_5粉末，助熔剂（例如CaCO_3）和粘合剂混合而成的。使用常规技术制备呈板状的各种预成型坯组合物，并且在还原之前将制造的预成型坯在1273 K下加热，以除去粘合剂和水。然后将包含Nb_2O_5的烧结的固体预成型件放入不锈钢容器中，并使其与镁蒸气在1073至1273 K的恒定温度下反应六小时。通过酸浸从还原的预成型坯中回收铌粉。结果得到纯度为99质量％的铌金属粉末。当控制焊剂的组成和还原条件时，发现该方法适合于生产均质的细粉。

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